Mechanism for the remote control of a frame saw



J. TRABEN 2,816,584 MECHANISM FOR THE REMOTE CONTROL OF A FRAME SAW Dec. 17, 1957 Filed May 9, 1955 INVENTOR JOSEF 'TRA BEN ATTORNEY 6 2,816,584 MECHANISM FOR THE REMOTE CONTROL OF A FRAME SAW Josef Traben, Oberkirch, Germany Application May 9, 1955, Serial No. 507,062 laims priority, application Germany July 5, 1949 1 Claim. (Cl. 143-105) This invention relates to a mechanism for the remote control of a frame saw from drags or from the bed of the saw.

The remote-control devices hitherto known, particularly on multiple-blade saws, operable from the front or rear drag or from the bed of the saw, are dependent on an external source of power or are so constructed that they do not operate reliably.

According to the invention there is provided in a frame saw a remote control mechanism comprising a rope forming a loop, the ends of which are preferably fixed at the end of the saw bed, and which is guided over an operating drum rotatable by said rope and coupled to an operating member on the frame, and through a guide which both the parts of the rope loop run under tension, which guide is equipped with idler rollers in order to form an additional loop in each strand and is movable along the bed of the saw, e. g. in the form of a slide or the like, said guide having two tension pulleys displaceable by means of a control lever and round each of which one part of the rope loop passes, the additional loops being thereby extended in opposite directions in such a manner that when the tension pulleys are displaced one part of the rope is lengthened and at the same time the other part of rope is shortened by and equal amount whereby as a result of the relative movements of the parts of the rope loop which thus occurs, the operating drum mounted on the frame is rotated.

The mechanism according to the invention makes it possible, as a result of the idler rollers used, to let the parts of rope run freely through the guide, so that this guide may, for example, be rigidly mounted on the drag and moved along the saw bed with the latter without any variation taking place in the length of the parts of rope as a result of this movement. The simplicity and reliability of the mechanism makes it possible to use it for remote-control for the most varied purposes. If several independent loops of rope are used, a corresponding number of independent controls on the frame can be actuated from a distance. It is also possible to cause several actuations with only one loop of rope, if the loop runs over several operating drums with each of which actuating devices are coupled. The arrangement of the guide on the drag, made possible according to the invention, enables the operator of the drag to remotely actuate several control devices quickly and reliably from his position on the drag; in doing so he can immediately satisfy himself that the operations which he has initiated have, in fact, taken place. If the operating member on the frame is controlled from places more remote than the drag or the bed of the saw, the loops of rope may conveniently be conveyed through cable conduits in the floor of the sawmill or the like.

An embodiment of a mechanism for the remote control of a frame saw according to the invention is hereinafter described, by way of example, with reference to the accompanying drawings.

Fig. 1 is a side view of the feed end of a frame saw, showing the guide of the mechanism mounted on a drag movable along the bed of the saw and the path of the parts of rope through the guide.

nited States Patent 2,816,584 Patented Dec. 17, 1957 Fig. 2 is a perspective diagram showing the disposition of the various rolls.

The saw frame 2 has an operating member 3 provided thereon, which can be actuated either on the frame itself, or, in accordance with the invention, also from a drag 1 of the frame saw. For this purpose the control member 3 is provided not only with a lever 4 arranged for direct operation, but also with an operating drum 5 rigidly coupled thereto. Round this drum runs a rope which is formed into a loop having two parts 6 and 7; the rope is rigidly connected to the pulley at 8. This rigid connection may be dispensed with if the friction of the rope on the drum is sufliciently strong to rotate the drum on movement of the rope, which may be achieved, for example, by winding the rope twice round the drum.

If there is a pull for example on the rope part 6, and corresponding loosening of the tension on the rope part 7, the pulley 3 will be turned in counterclockwise direction. The rope parts 6 and 7 pass into the bed of the saw over idler rollers 9 and 10. The ends of the rope parts 6 and 7 are fixed at 11 at the end of the saw bed. Before reaching this end, the part 7 passes over an idler pulley 12 mounted on the drag 1, a tension pulley 13 and an idler roller 14. The part 6 runs correspondingly over idler rollers 15 and 16, under the tension pulley 13 and then over the idler rollers 17 and 18 to the fixing point 11. The system of guide rollers described makes it possible, as can be seen from the drawing, for both parts of rope to run freely therethrough when the drag 1 is moved along the bed of the saw, without any variation in the length of the rope parts between the fixing point 11 and the operating drum 5 to be actuated.

Nevertheless, if the tension pulley 13 is displaced, one part of the rope is lengthened, while the other is shortened by an equal amount. Because both ends of the rope are fixed at the point 11 the adjustment of the tension pulley 13 by means of a double control lever 19 causes the two parts to move in opposite directions and as a result the operating drum 5 of the operating member 3 on the frame 2 is likewise positively turned.

I claim:

In a frame saw, a mechanism for the remote control of an operating member on the saw from a drag of the saw movable along the saw bed, comprising two parts of rope which are at one end operably connected one to each of the operationally opposite sides of the operating member and at the other end fixed to the end of the saw bed normally, a number of idler rollers attached to the drag and so arranged that a loop is formed in each of said parts of rope and the lengths of said loops remain constant when the drag is moved along the saw bed between said operating member and said remote end of the saw bed and tension pulley means displaceable by means of a control lever on the drag and around which pulley said loops pass in such a manner that the loops extend in opposite directions up and down so that when said tension pulley means is displaced vertically, one of said parts of rope is extended and the other of said parts of rope is shortened, whereby said operating member is actuated.

References Cited in the file of this patent UNITED STATES PATENTS 1,633,920 Bradford Jan. 28, 1927 2,305,170 Jackson Dec. 15, 1942 2,453,571 De Barbieri et al Nov. 9, 1948 2,536,875 Dalrymple Jan. 2, 1951 2,604,027 Hansen July 22, 1952- FOREIGN PATENTS 815,403 Germany m.-- Oct. 1, 1951 

